146 



Illinois Natural History Survey Bulletin Vol. 23, Art. 1 



527A 



XELLA 



531 A 



ARMATA 



VIRGATA 



534 A 



PERDITA 



536 



ANGUSTA A 



536 D 



537A 



CONSIMILIS 



538 A 



GRANDIOSA 



ALBICORNIS 



Figs. 527-539. — Hydroptila, female genitalia. A, eighth sternite; 5," bursa copulatrix; 

 C, eighth tergite; D, apex of abdomen. 



